輸出C語言中 變數的型別

使用gcc的警告資訊間接知道變數的型別

 

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>

int
main()
{
        int a[2][10];

        printf("%d\n", a[0]);
        printf("%d\n", a);
        printf("%d\n", a + 1);

        exit(0);
}

[root@localhost transform]# gcc -o test -Wall -g test.c
test.c: In function ‘main’:
test.c:14: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘int *’
test.c:15: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘int (*)[10]’
test.c:16: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘int (*)[10]’

gcc 的選項中加入 -Wall 即可